Dynamo-electric machine



(No Model.) J. H. ROBERTSON.

DYNAMO ELECTRIC MACHINE- No. 399,213. Patented Mar. 5, 1889;

UNITED STATES PATENT OEETCE.

JAMES H. ROBERTSON, OF RUTHERFORD, NFAY .E ISEY.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 399,213, dated March 5, 1889.

Application filed anuary 29, 1887. Serial No. 225,837. (No model.)

To aZZ whom it may concern.-

Be 1t known that I, JAMES H. ROBERTSON of Rutherford, Bergen county, New Jersey,-

have invented a new and useful Improvement in Dynamo-Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines; and the objects of my invention are, first, to produce in sucha machine an intense magnetic field with a minimum amount of wire, and, second, to concentrate the lines of magnetic force so that all of them will pass through the armature. I accomplish these objects by magnetically connecting the polepieces and entirely surrounding them, so that there will be no path for the escape of the magnetic lines of force, and by constructing the armature as hereinafter described and claimed, and so arranging the several parts that their practical construction is simplified and made compact in form, employing no more metal than can be utilized.

In the accompanying drawings, forming part of this specification, Figure 1 represents a vertical' cross-section of a machine embodying my invention, the cross-section being taken on line m of Fig. 3. Fig. 2 is a similar crosssection taken on line 3 y of Fig. 3. Fig. 3 represents a horizontal cross-section taken on line 2 .2 of Fig. 2. ture prior to the winding of the wire thereon.

Fig. it represents the armariphery.

To construct the armature so that it can be easily wound and a good path for the magnetic lines left, without at the same time increasing the facilities for Foucault currents to circulate through it, I place metallic disks 6, having projections 7, together in sets at intervals, with plain disks Sin smaller sets, the said disks 8 being of the same diameter, excepting the projections, as the disks 6, so as to form a cylinder with grooves 9 about its pe- The projections 7 also form longitudinal grooves 10, which are filled by the wires ll, wound around from end to end of the armature. The wires 11 are secured in place by binding-wires 12, as shown in Fig. 8, which press the wires ll into the grooves 9, so that an approximately even surface is formed on the periphery of the armature 5. The wires 12 may be secured in any suitable wayeither by tying or soldering them. The several disks, 6 and S, are magnetically separated and preferably electrically insulated from each other by any suitable insulation. (Indicated by the dark lines in Fig. l.)

The armature as above constructed is mounted on a shaft, 1 5, the parts thereof extending beyond the armature bein non-mag netic. A sleeve, ii, of rubber is interposed between the shaft 13 and the disks, the latter being held in place thereon in any suitable manner as, for example, by a rib, 15,011 the Fig. 5 shows a transverse cross-section of the armature. Fig. 6 represents one of the disks, with projections, of which the armature is composed. used in the armature.

I in the disks (5 and S.

Fig. 7 is one of the plain disks Fig.8 is a view of the l armature with the wires wound thereon secured by binding-wires.

In the drawings, the pole-pieces 1 are formed 1 integral with bases 2, or they maybe securely fastened thereto in any suitable manner. I join the bases of the pole-pieces by a section of a hollow iron cylinder, 3, or casing of other suitable shape, the joining being effected by screws or otherwise.

The pole-pieces 1 are wound, as shown in section at 4, and the armature 5, having its shaft mounted in bearings in the side of the cylinder 3, is located between the pole-pieces 1, and as near as possible to the samewithont touching them.

sleeve, located in a groove formed by notches If, instead of the armature constructed as above described, plain round disks were used having solid strips of iron fastened at intervals along the periphery of the disks, between which st rips wire was wound, it would detract from the current generated, by reason of the local currents setup in the several masses. If non-magnetic material is used, the space occupied by it is wasted so far as adding to the effectiveness of the current is concerned. this is the part of the machine where every inch of the armature should do useful work, and as the space to do it in is practically limited, it is obvious that by my construction thewhole oi. the armature is utilized.

I claim 1. In a dynamo-electuc machine, an arma ture formed of a set of disks provided with TOO projections of magnetic material, combined With a less number of plain disks arranged at intervals, substantially as described.

2. In a dynamo-electric machine, an armature formed of a set of disks provided with projections of magnetic material alternating with a less number of plain disks, the disks being magnetically separated from each other, substantially as described.

In a dynamo-electric machine, an arma- 4. In dynamo-electric machines, an armature composed of plain disks placed at intervals among a larger number of disks having projections of magnetic material, the same forming an armature having longitudinal and circumferential grooves, and Wire Wound longitudinally and secured by binding- Wires Wound in said circumferential grooves, substantially as described.

In testimony whereof I have hereunto subture constructed of plain disks placed at inscribed my name.

tervals among a larger number of disks with projections of magnetic material, the same forming an armaturehavinglongitudinal and 5 circumferential. grooves, substantially as described.

l l i i l 1 JAMES H. ROBERTSON.

\Vitnesses:

M. H. SEXTON, THEo. TORREY. 

